Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 10
·2675-2681
·
IF 5.934
Wei Xu,Lingjun Kong,Hui Huang,Ming Zhong,Yingying Liu,Xian-He Bu
Sn-Based materials are attracting increasing attention for application in sodium-ion batteries (SIBs), due to the ultra-high theoretical capacity of pure Sn. However, low structural stability and poor rate capability restrict their further development. Herein, a facile method is reported to embed Sn nanocrystals into a TiO2/porous carbon (TiO2/C) composite by direct carbonization of a mixture of tetraphenyltin and a Ti-based metal–organic framework. The obtained cylinder-like Sn/TiO2/porous carbon (Sn/TiO2/C) composite is uniformly built from TiO2 nanoparticles, Sn nanocrystals and N-doped carbon. Importantly, pores, formed by the accumulation of nanoparticles, can effectively restrict the huge volume change of Sn during cycling. When evaluated as an anode in SIBs, the Sn/TiO2/C composite not only possessed amazing cycling stability (159.6 mA h g−1 at 1.0 A g−1 after 3000 cycles), but also exhibited excellent rate performance (172.3 mA h g−1 at 1.0 A g−1 and 114.0 mA h g−1 at 10.0 A g−1). These superior properties can be attributed to Sn nanocrystals which enhanced specific capacity and electrical conductivity, and the TiO2/C substrate which improved structural stability, facilitating charge transfer kinetics.
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 26
·期 1
·1-11
·
IF 2.289
Xu Ruhui,Zhang Keyu,Wei Runhong,Yuan Meimei,Zhang Yenan,Liang Feng,Yao Yaochun
A facile, low cost, and low equipment-requirement preparation route of Si/C composite was developed. Naturally porous flour was carbonized through a conformal carbonization process and a further activation process in vacuum, obtaining flour-derived porous carbon (FPC) with ample pores. FPC was used to load nano-silicon through electrostatic adsorption method. Si-FPC was coated by sucrose-derived carbon (SC) shell by aqueous evaporation method to obtain Si-FPC-SC. Benefitting from FPC’s good dispersion for silicon, 40%-Si-FPC delivers a reversible capacity of 1562 mAh g −1 , equivalent to 83% of pure nano-silicon’s reversible capacity, an outstanding rate performance of 761 mAh g −1 at 1 A g −1 current density. The final 30%-Si-FPC-SC exhibits a reversible capacity of 937 mAh g −1 at 0.1 A g −1 , a cyclic retention of 82.3% after 100 cycles. Furthermore, the synthetic method of Si/C composites offers a universal idea for the research of high-capacity anode materials for lithium-ion batteries.
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Shaowen Dong,Haitao Geng,Wence Yue,Shumin Zheng,Xiaowan Pang,Jie Liang,Gaojun An,Wangliang Li,Bao Wang,Changbo Lu
Lithium-ion batteries (LIBs) have been extensively employed in a range of electrical vehicles and portable devices in virtue of their high energy density and stable cycle life. However, poor performance under low temperatures hinders their application in cold climates and regions. Herein, single-shell (carbon) multiple-core (ultra-small MnO@C nanoparticles) hollow carbon nanospheres (MnO@C@HCS) were prepared by a sacrificial template method, and MnO@C@HCS showed excellent low-temperature electrochemical performance. These MnO@C cores with large surface areas can shorten diffusion lengths of lithium ions and enhance diffusion rates along their rich grain boundaries, enabling rapid charging/discharging. The hollow carbon nanosphere with a porous shell can block serious agglomeration of nanoparticles and regulate the amount of electrolyte filled in the hollow nanosphere to reduce side reactions between highly active electrode materials and electrolytes. The hollow structure formed between the core and the shell mitigates the volume expansion and contraction during cycling. The MnO@C@HCS anode exhibits high specific capacities (1027 mAh g–1 at 0.20 A g–1) and high rate performance (353 mAh g–1 at 10.00 A g–1) under room temperature. Furthermore, the MnO@C@HCS anode maintains a satisfactory discharge capacity under low temperatures (461 mAh g–1 at 0.05 A g–1 under −10 °C, 220 mAh g–1 at 0.10 A g–1 under −20 °C, respectively). The contribution of pseudocapacitance to the capacity decreases as the test temperature drops. Our strategy provides a design concept for the high-performance anode for low-temperature lithium storage.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Baoqiang Li,Chang Liu,Zheng Fang,Zongxian Yang,Fei Ding,Liuyang Bai,Chun Wang,Fangli Yuan
Preparation of high-entropy carbides in bulk quantities and in powder form via simple methods at relatively low temperature is challenging. Here, we report the first synthesis of (ZrTiTaNbMo)C high-entropy carbide (HEC) powders via magnesiothermic reduction process. In this, a mixture of individual metallic oxides , graphite and magnesium is treated at a temperature of 1350 °C under Ar atmosphere. The (ZrTiTaNbMo)C powders are obtained after acid leaching, deionized water cleaning and drying process, and synthesized powders shows single-phase face-centered cubic ( fcc ) structure with the oxygen content of only 0.35 wt% and particle-size range of 5–60 µm. Such powders are in potential demand for additive manufacturing techniques, while high dense HEC bulk ceramic is fabricated by hot pressing sintering using ball-milled HEC powders in preliminary researches. The successful synthesis of (ZrTiTaNbMo)C powders may guide the way towards synthesis of many other high-entropy carbide powders via magnesiothermic reduction process.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Min Yang,Die Su,Wen Zhang,Jiaxing Wen,Wen Liu,Qi Luo,Li Liu,Xianyou Wang
The excellent electrochemical performance of indium sulfide (In 2 S 3 ) in lithium ion batteries (LIBs) and sodium ion batteries (SIBs) prompted us to explore its energy storage mechanism in potassium ion batteries (PIBs). In this work, In 2 S 3 /C nanofibers are successfully synthesized by simple electrospinning and subsequent vulcanization . In K half cells, compared to commercial In 2 S 3 electrodes, In 2 S 3 /C nanofibers as anode materials for PIBs show outstanding electrochemical performance, which can deliver reversible capacities of 397.6 (25), 366.2 (50), 335.2 (100), 307.8 (200), 260.4 (500) and 212.2 mAh g −1 (1000 mA g −1 ), respectively. In K full cells, In 2 S 3 /C nanofibers can also show good potassium storage performance and can light up 15 light emitting diodes (LEDs). The superb electrochemical performance of In 2 S 3 /C nanofibers is due to the in-situ composite with self-nitrogen-doped carbon matrix and the nanoization of In 2 S 3 particles, which buffers the volume effect and improves the conductivity of the material during the potassium storage process. In addition, the mechanism of potassium storage of In 2 S 3 /C nanofibers was systematically studied by cyclic voltammetry (CV), ex-situ XRD, TEM and XPS methods. The mechanism of In 2 S 3 for K-ion storage can be described as the conversion reaction: In 2 S 3 + 6K + + 6e − ⇌ In + 3K 2 S.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Liang Ni,Jugong Zheng,Cancan Qin,Yanwen Lu,Panxing Liu,Tongfu Wu,Yuefeng Tang,Yanfeng Chen
Spherical hierarchical LiFePO 4 /C cathode material was fabricated by a facile sol spray drying method using FePO 4 •2H 2 O, LiOH, oxalate acid (H 2 C 2 O 4 •2H 2 O) and sucrose as raw materials. A relatively low drying temperature 180 °C was adopted in order to form a uniform and thin carbon layer on the surface. The LiFePO 4 /C sample was characterized by physical and electrochemical measurements and the influence of the specific morphology on the electrochemical property was investigated. This cathode material had a reversible capacity of 160.9 mAh g −1 at 0.1 C and maintained 105.8 mAh g −1 at as high as 20 C with superior cycling performance. The excellent electrochemical property should be attributed to the carbon coated nanoparticles and a large specific surface area (36.5 m 2 g −1 ) provived by the spherical hierarchical structure.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Zheng-Guang Hu,Zhi-Yuan Tan,Zhong Lin,Jun Chen,Fang Sun,Xuyao Tang,Rui-Ting Zheng,Yong-Chong Chen,Guo-An Cheng
Si is one of the most attractive anode materials because of its extremely high theoretical capacity. In this study, we find that the (111) plane of crystalline Si in the anode is still present after 100 cycles and infer that it is the intercalation site of Li + ions. We believe that Li + ions are inserted into the tetrahedral sites of crystalline Si, and the (111) plane of Si collapses; meanwhile, expansion parallel to 〈220〉 crystal orientation occurs. After full lithiation , the crystalline Si is converted to amorphous silicon . In a Si/ composite anode, although the addition of amorphous carbon may improve the cycling performance of Si anode, the activation process is prolonged as the amount of amorphous carbon increased. We determine that amorphous carbon may reduce the diffusion of Li + , which increases the overpotential and results in the lower formation of the saturated Li/Si alloy.
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zijian Liao,Mingliang Ma,Yuxin Bi,Zhouyu Tong,Kwok L. Chung,Zijian Li,Yong Ma,Binglong Gao,Zhengkai Cao,Ranran Sun,Xiang Zhong
Advanced microwave absorption (MA) materials have attracted widespread attention to meet the challenges of electromagnetic (EM) pollution. Herein, MgFe 2 O 4 /MgO/C fibers were successfully prepared via electrospinning technology and carbonization , and their surfaces were coated by MoS 2 via hydrothermal method . The EM wave absorption performance of composites was enhanced due to the introduction of MoS 2 . The results showed that the EM wave absorption performance of MgFe 2 O 4 /MgO/C could not meet the requirements due to low dielectric loss and poor impedance matching. The performance of the composites was improved after coating of MoS 2 , which showed the strong wave absorption capability and the broad absorption bandwidth. The optimal reflection loss (RL) is −56.94 dB at 9.5 GHz and the effective absorption bandwidth is 3.9 GHz (8.08–11.98 GHz) with a thickness of 2.7 mm. The excellent MA performance can be mainly attributed to excellent synergistic effect between MgFe 2 O 4 /MgO/C and MoS 2 . Furthermore, MoS 2 also contributes to dielectric loss and ideal impedance matching. MgFe 2 O 4 /MgO/C@MoS 2 composites may be utilized for lightweight and high-efficient MA materials.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Peipei Zhang,Hanlei Sun,Xiuyuan Lu,Rena Oh,Nuowei Zhang,Ouardia Akdim,Alberto Roldan,Xiaoyang Huang,Binghui Chen
Hydrogen production from formaldehyde aqueous solution at room temperature shows a unique advantage regarding the bi-functional reaction route. MnO 2 was reported to be an active catalytic material for this process, especially after coating with carbon composite for improved active site distribution. Here, we unravel that the conversion of formaldehyde can be treated as two tandem half-reactions: the oxidative dehydrogenation (ODH) of formaldehyde and the hydrogen evolution reaction (HER). β-MnO 2 in a physical mixture with carbon ( i.e ., XC-72R, graphene) enhances both formaldehyde conversion (from 13% to 19.5%) and hydrogen productivity (from 22.35 μmol mg −1 h −1 to 33.86 μmol mg −1 h −1 ) by a synergistic effect of the phase separation catalyst in terms of electron redistribution and transport over the active sites. The catalyst examination supported by DFT calculation shows relatively low activation energy and band gap of β-MnO 2 + C with a density of states spanning the Fermi level . The discovery of this novel synergistic catalytic effect: a phase separation catalyst with cooperative enhancement, provides new insight into the area of tandem catalysis.
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Kai Gao,Song Cui,Sibo Liu
In terms of outcome prediction in patients with inflammation, albumin and C-reactive protein (CRP) at serum levels have been considered to constitute a practical and reliable scoring system. In the present work, highly sensitive detection of C-reactive protein (hs-CRP) was achieved via a new strategy using a quartz crystal microbalance (QCM) immunosensor. A linear relationship was found between the QCM response and CRP concentration (0.04 - 30 μg/mL), with a low limit of detection (LOD) maintained via an amplification process.
✓ 已验证
DOI
高影响因子
Energy Science & Engineering
·
2019
·Vol. 7
·期 3
·881-889
·
IF 2.893
Yanjie Zhu,Yang Yang,Xiaoguang Wang,Heng Zhong,Fangming Jin
Conversion of CO 2 into useful chemicals has been regarded as one promising method to mitigate the problem of global warming. However, developing an efficient method for CO 2 reduction with facile hydrogen source is still a great challenge. In this study, a new and straightforward method to convert NaHCO 3 , a model compound of CO 2 in basic solution, into formate with 2-pyrrolidone, a model compound of protein-containing biomass, as the reductant on a Pd/C catalyst in water was proposed. Results showed that a formate yield up to 30% from bicarbonate was successfully obtained over the Pd/C catalyst, and the Pd/C catalyst exhibited good catalytic activity and stability. Detailed studies revealed that the propanol generated from the decomposition of 2-pyrrolidone under hydrothermal conditions acted as the actual reductant and hydrogen source for the bicarbonate reduction to formate. Since 2-pyrrolidone can be readily generated from the proteins contained in biomass, the present research provides a promising technology of NaHCO 3 reduction with biomass as the hydrogen source and the renewable energy input, thus it is green, sustainable, and promising for practical application.
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 27
·6006-6016
·
IF 4.857
Shien Pei,Jianfeng Guo,Zhishun He,Liang-ai Huang,Tongzhou Lu,Junjie Gong,Haibo Shao,Jianming Wang
Graphical Sharing a shell : Porous Si-Cu 3 Si-Cu microsphere@C core–shell composites fabricated by an etching/electroless deposition and subsequent carbon coating show excellent lithium storage performance. Low-cost Si-based anode materials with excellent electrochemical lithium storage present attractive prospects for lithium-ion batteries (LIBs). Herein, porous Si-Cu 3 Si-Cu microsphere@C composites are designed and prepared by means of an etching/electroless deposition and subsequent carbon coating. The composites show a core–shell structure, with a porous Si/Cu microsphere core surrounded by the N-doped carbon shell. The Cu and Cu 3 Si nanoparticles are embedded inside porous silicon microspheres, forming the porous Si/Cu microsphere core. The microstructure and lithium storage performance of porous Si-Cu 3 Si-Cu microsphere@C composites can be effectively tuned by changing electroless deposition time. The Si-Cu 3 Si-Cu microsphere@C composite prepared with 12 min electroless deposition delivers a reversible capacity of 627 mAh g −1 after 200 cycles at 2 A g −1 , showing an enhanced lithium storage ability. The superior lithium storage performance of the Si-Cu 3 Si-Cu microsphere@C composite can be ascribed to the improved electronic conductivity, enhanced mechanical stability, and better buffering against the large volume change in the repeated lithiation/delithiation processes.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）